"A glass of blood" is an exciting book that combines elements of detective, thriller and fantasy. The main character, detective John Smith, investigates a series of brutal murders that have an unusual connection with an ancient ritual of treasure hunting. Amid the atmosphere of mystery and mysterious events, the reader is immersed in a world where magic and reality intertwine, revealing the secrets that lie in the very heart of darkness. "A glass of blood" is a book that fascinates and keeps you in suspense until the last page, where every twist and mystery leads to an unexpected ending.